Encapsulation of Iodine in Nitrogen-Containing Porous Carbon Plate Arrays on Carbon Fiber Cloth as a Freestanding Cathode for Lithium-Iodine Batteries,ACS Applied Energy Materials

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Encapsulation of Iodine in Nitrogen-Containing Porous Carbon Plate Arrays on Carbon Fiber Cloth as a Freestanding Cathode for Lithium-Iodine Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-06-29 , DOI: 10.1021/acsaem.1c01068
Lei Qiao ₁ , Chao Wang ₁ , Xiu Song Zhao ₂

Affiliation

Rechargeable lithium-iodine (Li-I₂) batteries are a promising energy storage technology because of their cost-effectiveness and nature abundance of iodine. However, the low electron conductivity, slow diffusion kinetics, and poor stability of iodine are the big hindrances to the technology development. We report here an approach to improving iodine cathode performance by stabilizing iodine with polyvinylpyrrolidone (PVP) and porous nitrogen-containing carbon plate arrays (PNCA) grown on carbon fiber cloth. This freestanding composite electrode exhibits a charge storage capacity of 132 mA h g^–1 at 5C and stable cycling stability (150 mA h g^–1 after 1000 cycles at 1C). The cycling stability of the electrode is due to the confinement effect of PNCA and PVP via both physical and chemical forces. In situ Raman spectroscopy results suggest that the I₃^–/I^– redox couple is highly reversible during galvanostatic charge/discharge cycling. The pseudocapacitive lithium storage behavior of the composite electrode enables its high rate performance in Li-I₂ batteries. This work provides a facile approach to designing freestanding cathode materials for high-rate and stable Li-I₂ batteries.

中文翻译：

在碳纤维布上的含氮多孔碳板阵列中封装碘作为锂碘电池的独立阴极

可充电锂碘 (Li-I ₂ ) 电池因其成本效益和碘的天然丰富性而成为一种很有前途的储能技术。然而，碘的电子电导率低、扩散动力学慢、稳定性差是阻碍技术发展的一大障碍。我们在此报告了一种通过在碳纤维布上生长的聚乙烯吡咯烷酮 (PVP) 和多孔含氮碳板阵列 (PNCA) 来稳定碘来提高碘阴极性能的方法。这种独立式复合电极在 5C 下具有 132 mA hg ^–1的电荷存储容量和稳定的循环稳定性（150 mA hg ^–1在 1C 下 1000 次循环后）。电极的循环稳定性是由于 PNCA 和 PVP 通过物理和化学力的限制效应。原位拉曼光谱结果表明，I ₃^- /I ^-氧化还原对在恒电流充电/放电循环过程中是高度可逆的。复合电极的赝电容锂存储行为使其在 Li-I ₂电池中具有高倍率性能。这项工作为设计用于高倍率和稳定 Li-I ₂电池的独立阴极材料提供了一种简便的方法。

更新日期：2021-07-26

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